US5721936A - Timer-controlled computer system power management - Google Patents
Timer-controlled computer system power management Download PDFInfo
- Publication number
- US5721936A US5721936A US08/687,162 US68716296A US5721936A US 5721936 A US5721936 A US 5721936A US 68716296 A US68716296 A US 68716296A US 5721936 A US5721936 A US 5721936A
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- power
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3215—Monitoring of peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
Definitions
- the present invention is in the area of power control methods and apparatus for computer systems and pertains more specifically to automatically timed startup and shutdown of such systems.
- a first mode which may be called peak mode, provides the power-on surge, which may be, for example, 90 watts.
- a second mode which may be called normal mode, supports routine computer operations with full expansion capabilities at, for example, about 50 watts.
- a third mode which may be called suspend mode, powers down computer processing activity but retains random access memory (RAM) at a lower power level, which in this example may be about 10-15 watts.
- a fourth mode which may be called standby mode, powers down everything except a wakeup circuit, in this example about 1-2 watts.
- a power-saving computer may consume as little as 1-2 watts in standby mode and 90 watts or more during power-on, a ratio of as much as 1:90 or higher.
- a system for managing power levels for a general-purpose computer having an electrically operable power switching means for switching power between a full-power mode and a standby power mode drawing less than full power.
- the system includes a real time clock remaining powered in the standby power mode, and control means including logic routines operable in the full-power mode for providing initiation times for the startup and the standby power modes to the real time clock.
- the real time clock provides a first signal to the power switching means to initiate standby mode and a second signal to initiate full-power mode based on specific times provided to the real time clock by the control means.
- standby and full-power modes may be initiated either by the real time clock with times provided by the control means, or alternatively by user input, such as by specific keystroke signals at a keyboard or use of a pointer device.
- time of user activity is used by the control means through logic routines to calculate optimum initiation times for full-power and standby modes.
- FIG. 1 is a block diagram for a system configuration according to an embodiment of the present invention.
- FIG. 2 is a logic flow diagram of timer-controlled shutdown according to the embodiment of FIG. 1.
- FIG. 3 is a logic flow diagram of timer-controlled startup according to the embodiment of FIG. 1.
- FIG. 1 is a block diagram of a system configuration for an embodiment of the present invention.
- the power supply configuration in this embodiment comprises a highly efficient power supply subsystem using two power supplies for supporting greatly varying power consumption in four operating modes as described in the Background section above. It is known to the inventors to provide such a configuration comprising a dual power supply unit 11 having power supplies A and B. Power supply A in this configuration is termed a Command supply, and power supply B, a Main supply.
- FIG. 1 supports an arbitrary total peak power consumption of about 90 watts in this example with power being divided between the two units, which allows optimal equalized distribution not possible with a single-source power supply.
- Command supply A provides regulated voltages on line 13 of -5, +12, and -12 volts to system peripherals 19 at a peak of about 45 watts, and is connected in addition by line 13 to the operating element of a solid-state switch 27 which supplies power to system board 21 through normally open contacts from power supply B.
- Main supply B provides regulated voltage on path 15 of +5 volts and +3.3 volts, also with a peak capacity of 45 watts.
- Main supply B in this embodiment powers system board 21 through switch 27 as described above, which in turn operates all related bus, memory, and microprocessor power requirements, and also powers keyboard controller (KBC) 23, keyboard 25, and real time clock (RTC) 26.
- Power supplies A and B are provided with primary power originally through a manual switch not shown in FIG. 1, but after original power up, control is through the present startup and shutdown control system.
- the power subsystem goes to standby mode by a signal on line 40 from KBC 23, which operates a solid-state switch to turn off primary power to power supply A.
- standby mode only command supply A is shut down while main supply B remains active.
- KBC 23, KBD 25, and RTC 26 remain powered by line 15 from power supply B, and system board 21 loses power because switch 27 opens when line 13 loses power.
- the pointer device is also active in standby as is the KBD.
- a suspend mode as described in the Background section, may be supported through a separate signal on line 18 from KBC 23, bypassing the usual supply to the system board through switch 27.
- the hardware configuration may include a ring indicator (RI) 10 for a fax system or other modem-type device.
- RI 10 may be powered from line 15 as shown in FIG. 1, or may be separately powered, and has an output to KBC 23 as do KBD 25 and RTC 26 on line 12.
- KBC 23 as do KBD 25 and RTC 26 on line 12.
- an incoming call or fax wakes up the system, which may then respond by receiving and processing the incoming data. After the incoming data is processed, the system may be programmed to return to a standby or suspend mode.
- KBD 25 (and a pointer, if used), RTC 26, KBC 23, and RI 10 (if used) constitute a wake-up circuit.
- KBD 25 (or a pointer device) signalled on line 12, or on signal from RTC 26 also on line 12, or on signal from RI 10, also on line 12, KBC 23 may signal power supply A on line 40 to power up, restoring full power to the system.
- timed shutdown to standby level and subsequent startup of the system is provided by RTC 26, which, although shown as powered by power supply B, may also be battery powered to maintain function when all power is lost.
- Shutdown and startup times are provided to RTC 26 by power management control routines represented in FIG. 1 by routines 20 associated with system board 21.
- the power management control routines in this embodiment referred to as Timer-Controlled Power Management (TCPM) routines, may reside in system BIOS, as a separate system controller, or as a peripheral on the system expansion bus that is wired to the real time clock.
- the TCPM routines only run when the power system is fully powered or in a suspend mode; that is, when system board 21 is powered.
- the TCPM routines are configurable to set startup times for normal business days, for weekends, for holidays, and also may be tailored in various embodiments to provide automatic adjustment of startup and shutdown times according to specific events.
- the TCPM routines have an ability to extend the shutdown time incrementally according to user activity.
- the system begins to monitor user activity. If no input activity is monitored, the shutdown time in the RTC remains the default time, and the RTC signals the system at that time to go to standby mode. If user input is recorded within the 5 minute window before default shutdown time, the TCPM routines add 5 minutes to the default, send that time to the RTC, and continue to monitor for user input. Shutdown only then occurs if a period of time passes greater than 5 minutes without user input.
- the TCPM routines may be programmed to start the system from standby each morning at a programmed default time, such as at 7:00 a.m. for a business day. The system will also start before 7:00 a.m. if user input is detected.
- the TCPM routines record the startup time each day if activated by a user, and over a period of record a new default time is calculated tailored to the particular usage pattern of the individual user.
- an embodiment of the invention configured to shut down based on periods of inactivity, and to start based on logged data of user activity, need have no direct input for setup. In most cases, however, means is provided for an administrator to access the TCPM routines and make certain default settings, and in some cases to select specific management routines in preference to others available, or even to tailor new management routines.
- FIG. 2 is a logic flow diagram of the basic shutdown function described above, where shutdown actually is standby mode.
- a shutdown time window as described above, being a certain number of minutes before a default shutdown time, is programmed into the real time clock's addressable program registers by the TCPM routines.
- the real time clock In full-power mode 29 the real time clock continually monitors the time at function 30.
- an onscreen shutdown warning message is optionally issued at function 32 so the user can do an orderly closure of files for the day.
- user activity is monitored at decision point 33. If no user activity is detected within the shutdown time window and shutdown time is reached at function 37, operations are shut down to standby mode at function 41.
- shutdown is delayed at function 35 by extending the shutdown time beyond the default shutdown time. Delay shutdown looping continues until no user activity is detected within the latest delayed time window, at which time the system is shut down to standby mode.
- FIG. 3 is a logic flow diagram of startup in an embodiment as described above. While the computer is in standby mode at function 43, the KBD (and pointer), KBC and RTC remain powered. The RTC monitors at function 44 whether time is in a programmed startup window at function 45. There may either be a programmed startup window, or all the time in standby may be considered a startup window.
- the computer starts in full-power mode at function 55.
- the TCPM routines start running.
- the TCPM routines monitor system activity and record all shutdown and startup times. If there is a consistent trend of earlier or later startups or shutdowns over a number of days, the routines automatically adjust the startup initiation time. If user activity is not detected prior to clock time reaching the startup default time at decision point 48, the computer starts in normal mode at function 55 at the default startup time.
- an onscreen menu interface adds flexibility to the TCPM functions described in FIGS. 2 and 3 by allowing the user to specify timing control conditions and parameters while the system is operating in normal mode.
- the format of such an interface and the functions it performs may vary widely, and the mechanisms by which such onscreen inputs may be made are well known in the art, and need not be fully described here.
- the TCPM routines may provide secured access control for networked computer users through an onscreen menu interface. Varied degrees of control can be maintained by a system administrator, from free access for selected computer users to strictly regimented shutdown and startup schedules and security access procedures across the entire network.
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US08/687,162 US5721936A (en) | 1993-10-27 | 1996-07-24 | Timer-controlled computer system power management |
US08/908,534 US5920727A (en) | 1993-10-27 | 1997-08-07 | Timer-controlled computer system shutdown and startup |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/143,830 US5542035A (en) | 1993-10-27 | 1993-10-27 | Timer-controlled computer system shutdown and startup |
US08/687,162 US5721936A (en) | 1993-10-27 | 1996-07-24 | Timer-controlled computer system power management |
Related Parent Applications (1)
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US08/143,830 Continuation US5542035A (en) | 1993-10-27 | 1993-10-27 | Timer-controlled computer system shutdown and startup |
Related Child Applications (1)
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US08/908,534 Division US5920727A (en) | 1993-10-27 | 1997-08-07 | Timer-controlled computer system shutdown and startup |
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US5721936A true US5721936A (en) | 1998-02-24 |
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US08/687,162 Expired - Fee Related US5721936A (en) | 1993-10-27 | 1996-07-24 | Timer-controlled computer system power management |
US08/908,534 Expired - Fee Related US5920727A (en) | 1993-10-27 | 1997-08-07 | Timer-controlled computer system shutdown and startup |
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US08/143,830 Expired - Fee Related US5542035A (en) | 1993-10-27 | 1993-10-27 | Timer-controlled computer system shutdown and startup |
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US08/908,534 Expired - Fee Related US5920727A (en) | 1993-10-27 | 1997-08-07 | Timer-controlled computer system shutdown and startup |
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EP (1) | EP0725949B1 (en) |
JP (1) | JP3522763B2 (en) |
AT (1) | ATE201778T1 (en) |
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WO (1) | WO1995012158A1 (en) |
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Also Published As
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EP0725949B1 (en) | 2001-05-30 |
US5920727A (en) | 1999-07-06 |
JP3522763B2 (en) | 2004-04-26 |
US5542035A (en) | 1996-07-30 |
EP0725949A1 (en) | 1996-08-14 |
WO1995012158A1 (en) | 1995-05-04 |
DE69427367T2 (en) | 2001-10-31 |
DE69427367D1 (en) | 2001-07-05 |
JPH09507107A (en) | 1997-07-15 |
EP0725949A4 (en) | 1997-02-05 |
ATE201778T1 (en) | 2001-06-15 |
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